Boltless design with light oak laminate shelves offer a clean, attractive appearance while maintaining durability. Double wall uprights conceal the keyhole slots for a clean, attractive appearance. Units ship in single cartons. Starter and Adder units available. Shelves adjust on 1" increments to create custom openings for books, binders, supplies and more. Shelves hold up to 600 lbs. per shelf, and stand up to almost any storage application. Polyethylene feet protect your flooring and carpet.